Living lancetooth, found under a log like all the other living snails we found.
Neil was surprised to find an all-yellow individual this far north. Apparently the position of the air hole with respect to the mantle can be diagnostic, as can the presence of dirt along the tail end.
I know I've seen pictures of something like this, just need to hunt them down...
Lots of these around today. Found two logs with a big adult and a small juvenile. Bigger was male under one log, female under another. Coincidence or pattern?
An example of what looks to me like an intermediate Helminthoglypta. From the photos I took it seems like lip of the aperature curves more in H. arrosa, which would suggest arrosa for this one, though the umbilicus seems half covered.
Umbilicus fully covered, and I *think* I can see the reticulated pattern on the shell described by Pilsby: http://babel.hathitrust.org/cgi/pt?id=uc1.31822013176466;view=1up;seq=118
A predatory snail that eats other snails. Its shell is almost flat when viewed from the side, i.e. the spiral doesn't really go up.
A living individual found between the bark and wood of a fallen log.
In "northern San Mateo county" there are supposedly two species of Helminthoglypta, H. arrosa and H. nickliniana. The former has an open umbilicus (the hole in the middle of the spiral of the shell when viewed from below), while the latter has a flag of the aperture covering the umbilicus. This and many others were found at the bottom of a slope. Coast live oak was the dominant tree.
I think this was nickliniana...
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